Apparatus for wireless telegraphy.



G. MARCONI., APPARATUS FOB. WIRELESS TELBGRAPHY. AIPILIUATIGH FILED HAE.31, 1909.

954,640, Patented Apr. 12,1910.

ling

which are carried in UNITED sTATEs PATENT OFFICE.

GGLIELIOQEARJCONI, 0F LONDDN, ENGLAND, ASSIGNOR T0 MARGUNI WIRELESSTELEGRAPH COMPANY 0F AMERICA. 0F NEW YORK, N. Y., A CORPORATION GF NEWJERSEY.

AIP-PARATUS FOR WIRELESS TELEGBAPHY.

Patented Apr. 12, 1910.

Application filed March 31, 1909. Serial No. 487,067.

T o all whom it may concern:

Be it known that I, GUoLiELMO MARC-oni, LL. D., D, Sc., a subject of theKing of Italy, residing at lVatergate House, Adel.- phi, London,England, have invented new and useful Improvements in Apparatus forWireless Tele rraphy, ot which the followA is a spccidization.

This invention relates to transmitting a paratus for wireless telegraphyin which t e discharge takes place across a small gap betweendiscontinuous metal surfaces in rela tire motion at a very high speed.

According to this invention the moving surfaces consist oi' pegs orstuds on the adjaCertbtaces of two parallel disks fixed to two shafts ina line with each other and revolved in opposite directions, the shaftsbe ing mount ,d in insulated bearings. In place of the dis sbeing'parallel they may be sot at an angle but this is not The accompanyingdia rain shows a transmitting apparatus madie in accordance with thisinvention.

a and ai are the tw parallel disks respectively provided with pegs orstuds and b and mounted on .shafts c and c' bearings d and el. The studsare preferably equally spaced and the numbers of the studs on the twodisks are equal.

e and e are motors or pulleys for connecting to motors, by means ofwhich the disks o and a are driven in opposite diree tions. The bearingsfl and cl are insulated from the ground, and the motors or p uliys e ande are respectively insulated from the shafts c and c.

The parallel disks o and a aire connected by means of brushes f and f tothe plates of a condenser r/ and this condenser circuit is upled at i tothe aerial j. The plates of the c'ondcnser g are4 also connected thr ughsuitable inductancos l.: and to a genlizrator Z so as to form anoscillation cir- Disks two .feet in diameter having two studs andruiming at a speed of e i elicit 30() revolutions per minute are foundto.

work well in practice. It is found moreover that far better results areobtained with studs ot copper than with studs coinposed of any othermaterial.

so advantageous.

i circuit in henrys.

' Sto In order to obtain the best results it is necessary to give suolivalues to the condenser g and inductances c and 7: as will make the timeperiod of this circuit equal to or some integral multiple or submultipleof the interval of time between two Successive discharges of thecondenser. The time pcriod of this circuit is approximately equal to 2fn/CIQ where C is the capacity of the condenser in farads and L is theinductance of the whole The interval of time between two successivedischarges of the. condenser is equal to LWN (X,{X,) where N is thenumber of pegs or Studs on either revolving disk, X1, is the number ofrcvolu tions per second of one disk and X2 is the number of where m isan integer.

By means of this invention it is possible to discharge the condensertwice as rapidly as with a single revolving disk, while owing to all thepegs on one side being opposite to the pegs on the other disk at thesame instant the discharge may take ilace at. any of the By this invention 1t is moreover possiv efiiciently utilize a` large amounty o power,and to emit oscillations in regular groups ot' a frequency to which anappropriate receiver may be tuned. and such asto produce in a telephoniereceiver a note which isJ readily distinguished from the noises causedby atmospheric disturbances.

What I claim is l. In a wireless telegraph transmitter the combinationof two parallel disks, means for rapidly rotating the disks in oppositedirections, studs equally spaced around the adpicent. faces of the disksand an oscillation cirrcuit connected to the disks.

Q. In a wireless telegraph transmitter-the combination of two diskshaving oppositely disposed parallel faces, means for rapidly rotatingthe disks in opposite directions, an equal number of studs equallyspaced around that face of each disk which is adjacent to spaced aroundthat face of each disk which the other disk and an oscillation circuitconis adjacent to the other disk, and an oscilla- .l nected to thedisks. l tion circuit connected to the disks.

3. In a wireless telegraph transmitter the GUGLIELMO MARGONI.combination of two parallel disks, means for Witnesses: rapidly rotatinthe disks in opposite direc P. C. MAPINI, tions, an equa number ofstudsequally HENRY W. ALLEY.

Correction 'in Letters Patent No. 954,640.

It is hereby certified that the names of the witnesses tothe signatureto the specification of Letters Patent No. 954,640, granted April 12,1910, upon the application of Guglielmo Marconi, of London, England, foran improvement in Apparatus for Wireless- Telegraphy,"y were erroneouslyprint/ed 1). C. Mapini and Henry W. Alley, whereas said names shouldhave been printed I?. E Maqu-e ami' Henry W Allen; and that the saidLetters Patent should be read with thir' correction therein that. thesame may conform to the record of the case in thv Patent Oice. l i

Signed and sealed this 3d day of May, A. D., 1910.y l

[mcj A' o. o.V BILLINGs,

l Acting Commissioner ofPatenta.

that face of each disk which is adjacent to spaced around that face ofeach disk which the other disk and an oscillation circuit conis adjacentto the other disk, and an oscilla- .l nected to the disks. l tioncircuit connected to the disks.

3. In a wireless telegraph transmitter the GUGLIELMO MARGONI.combination of two parallel disks, means for Witnesses: rapidly rotatinthe disks in opposite direc P. C. MAPINI, tions, an equa number ofstudsequally HENRY W. ALLEY.

Correction 'in Letters Patent No. 954,640.

It is hereby certified that the names of the witnesses tothe signatureto the specification of Letters Patent No. 954,640, granted April 12,1910, upon the application of Guglielmo Marconi, of London, England, foran improvement in Apparatus for Wireless- Telegraphy,"y were erroneouslyprint/ed 1). C. Mapini and Henry W. Alley, whereas said names shouldhave been printed I?. E Maqu-e ami' Henry W Allen; and that the saidLetters Patent should be read with thir' correction therein that. thesame may conform to the record of the case in thv Patent Oice. l i

Signed and sealed this 3d day of May, A. D., 1910.y l

[mcj A' o. o.V BILLINGs,

l Acting Commissioner ofPatenta.

Correction ln Letters Patent No. 954,640.

i It is hereby certified that the names of the witnesses to thesignature to the i specification of Letters Patent No. 954,640, grantedApril 12, 1910, upon the application of Guglielmo Marconi, of London,England, for an improvement in Apparatus for Wirelese Telegraphy," wereerroneously printed P. C. Mapini and Henry Alley," whereas said namesshould have been printed I?. E. Maguire and l/emy W Allen; and that thesaid Letters Patent should be read with this correction therein that thesame may coliform to the record of the case in thi Patent Oice.

Signed and sealed this 3d day of May, A. D., 1910.

' C. c.' BILLINGS,

Acting Commissmer of Patents.

